Accession Number:

AD0687130

Title:

A METHOD FOR THE PREDICTION OF THE FARFIELD FROM NEARFIELD MEASUREMENTS OF THE AMPLITUDE ALONE.

Descriptive Note:

Scientific rept.,

Corporate Author:

PARKE MATHEMATICAL LABS INC CARLISLE MASS

Personal Author(s):

• Butler,John L.

Report Date:

1969-05-01

Pagination or Media Count:

20.0

Abstract:

A method is presented for the prediction of the farfield from nearfield measurements of only the amplitude of a sound source. The method is based on a finite series expansion of the auto-power in the field. A numerical evaluation is given for a small theoretical source distribution under incoherent, partially coherent, and coherent conditions and it is shown that good results can be obtained if enough nearfield measurements are made. Author

Descriptors:

• (*SOUND TRANSMISSION
• MATHEMATICAL PREDICTION)
• NUMERICAL ANALYSIS
• SERIES(MATHEMATICS)
• PRESSURE
• INTENSITY
• MEASUREMENT
• WAVE FUNCTIONS

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE